Here are a few rumours about what will change in 2015:
- New 4D Film, featuring The Rustis
- Improvement on Arthur (They hope to run 8 trains on it)
- Improvement on Geisterschloss (Small updates as every year)
- Karneval in Venedig (The Vogel Show) could be closed, There already is no signs of it on the new website
2015 will be a quiet year, absolutely no doubt about it.
Also Europa Park has confirmed that they are already working on a new attraction, maybe for 2016 or 2017, aside from the the Water Park project.